GM Service Manual Online
For 1990-2009 cars only

Use the scan tool data display values and definitions information in order to assist in diagnosing vehicle malfunctions. Compare the vehicles actual scan tool data with the typical data display value table information. Use the information in order to aid in understanding the nature of the concern when the vehicle data does not match the typical data display values.

The scan tool data values were taken from a known good vehicle under the following conditions:

    • The ignition switch is in the Run position.
    • The engine is not running.
    • The vehicle is in PARK.

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON, Engine OFF

Accy/RAP Relay Command

Power Mode

On/Off

On

Battery Voltage

Charging Info

Volts

Varies

Current Power Mode

Power Mode

Off/Accessory/Run/Crank Request

Run

HS Comm. Cmd.

Outputs

On/Off

On

Ign. Off/Run/Crank

Power Mode

Key Out/ACC

Key In/Off

Crank

Run

Run

Ignition Accessory/Run

Power Mode

Active/Inactive

Active

Ignition Run/Crank

Power Mode

Active/Inactive

Active

Key in Ignition Status

Power Mode

Key Out/Key In

Key In

Powertrain HS Comm. Cmd.

Outputs

On/Off

On

Run/Crank Relay Command

Power Mode

On/Off

On